Pretty sure digging past comments goes against the guidelines. It's also a primitive an absolutist way of judging a comment (rather than on, say, its substance).
What if the substance of the comment is just erroneous or poorly intention-ed? How am I supposed to tell if it's a paid corporate shill or a genuine fossil fuel lover?
The idea is to assume good faith. If it can't be done, I think not answering is the best course of action.